I always get confused with TDC...compression stroke
Found this to be useful:
https://www.yourmechanic.com/article/how-to-find-an-engine-s-top-dead-center-by-ed-ruelasFor timing, the #1 piston at TDC
on the compression stroke is the ONLY thing that matters. Note in the simple instructions on the link above, one of the first things they are having you do is ensure you are on the compression stroke.
If you are on the
exhaust stroke (or "other") I don't think you'd see the marks line up on the balancer as it would be 180 degrees out...right?
When using a timing light after the fact--engine running and all that--you may find that the numbers and timing are hard to read. With the engine stopped and in near TDC position, best to clean the markings area and maybe highlight with white crayon or similar so you can better see with the strobe...